回調找到（）被調用多次

我與貓鼬瞎搞，而且我注意到，節約了無效項目時我find回調被多次調用：回調找到（）被調用多次

persist.js

mongoose.model('ContentTag', new mongoose.Schema({ 
    content: requiredString, 
    tag:  requiredString 
}));

test.js（使用摩卡）

describe('content tag', function() { 
    it('should not save an empty content tag', function(done) { 
     persist.ContentTag().save(function(err) { 
      assert.ok(err); 

      persist.ContentTag.find(function(err, items) { 
       assert.equal(0, items.length); 
       done(); 
      }); 
     }); 
    });

這將產生以下錯誤輸出：

Save err: ValidatorError: Validator "required" failed for path tag 
Save err: ValidatorError: Validator "required" failed for path content 
Find err: null 
Find err: null

與以下錯誤：

1) Persist content tag should not save an empty content tag: 
    Error: done() called multiple times 
     at multiple (/usr/local/lib/node_modules/mocha/lib/runnable.js:168:31) 
     at done (/usr/local/lib/node_modules/mocha/lib/runnable.js:174:26) 
     at Runnable.run.duration (/usr/local/lib/node_modules/mocha/lib/runnable.js:190:9) 
     at persist.ContentTag.content (path/test/server-test.js:21:21) 
     at Query.execFind (path/node_modules/mongoose/lib/mongoose/query.js:572:26) 
     at Cursor.toArray (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:122:15) 
     at Cursor.each (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:167:11) 
     at Cursor.nextObject (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:467:28) 
     at Cursor.close (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:625:17) 
     at Cursor.nextObject (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:467:10) 
     at Cursor.nextObject.commandHandler (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:452:15) 
     at EventEmitter.emit (events.js:96:17) 
     at Db.open.self.serverConfig.connection.addListener.self.state (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/db.js:90:12) 
     at EventEmitter.emit (events.js:93:17) 
     at Connection.open.receiveListener (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/connection.js:82:16) 
     at Socket.Connection.open.receiveListener (path/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/connection.js:85:16) 
     at Socket.EventEmitter.emit (events.js:93:17) 
     at TCP.onread (net.js:391:31)

看起來當有多個驗證錯誤一樣，保存回調爲每個錯誤調用一次。

當我刪除了new關鍵字，我得到以下錯誤：

1) Persist content tag should not save an empty content tag: 
    TypeError: Object #<Object> has no method 'buildDoc' 
     at Object.Document (../node_modules/mongoose/lib/mongoose/document.js:26:19) 
     at Object.Model (../node_modules/mongoose/lib/mongoose/model.js:24:12) 
     at Object.model [as ContentTag]

來源

2012-12-09 Nick Heiner

嘗試刪除'new'關鍵字？ – theabraham

有趣的想法，但它沒有奏效。（OP已更新） –

在回調中添加檢查和記錄「err」可能有助於診斷正在發生的事情。 – JohnnyHK

回調save爲每個驗證err調用一次。因此，我多次致電done()。回想起來，沒有必要斷言err已被定義，並且find()調用是空的。

來源

2012-12-11 19:43:56

回調找到（）被調用多次

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